Device for cutting circumferentially-arranged material



Oct. 19 1926. 1,603,859

T. MIDGLEY DEVICE FOR CUTTING CIRCUMFERENTIALLY ARRANGED MATERIAL Filed April 26, 1923 2 Sheets-Sheet 1 ATTORN Oct. 19 1926. 1,603,859

T. MIDGLEY DEVICE FOR CUTTING CIRCUMFERENTIALLY ARRANGED MATERIAL Filed April 26, 1923 2 Sheets-Sheet 2 /4' All/III will.

INVENTOK BY Z4,

ATTORN Patented @ct. 19, 1926..

1,603,859 PATENT OFFICE.

THOMAS MIDGLEY, F HAMPDEN, MASSACHUSETTS, ASSIGNQR TO THE FI SK BUB- BER COMPANY, OF CHICOPEE FALLS, MASSACHUSETTS, A CORPORATION OF MASSA- CHUSETTS.

nnvrcn non cur'rrne cmcUmrnRENrIALLY-AnneneEn MATERIAL.

Application filed April 26, 1923. Serial No. 634,783.

This inyention relates to devices for cutting material arranged in circumferential or tubular formation, particularly with respect to improvements in such devices from standpoints of rapidity and accuracy of operation.

The device, which will he described with reference to the accompanying drawings, is illustrated for convenience in the environ ment of a tire building machine-such as that shown in my rior applications Serial No. 547,081, filed arch 27, 19 22, and 283,- 879, filed March 20, 1919, of which the present application is a continuation in part. I

Fig. 1 is an end view of the knife and con necting parts, with the knife in promoted position;

' Fig. 2 is a similar view showing the kmfe retracted;

' Fig. 3 is a section through the knife mechanism and the tire building mechanism adjacent, the latter being shown in phantom;

Fig. 4 is. a side elevation illustrating one form of driving mechanism for the knife;

Fig. 5 is a detail longitudinal section thereof;.

Fig. 6 is a transverse section on line 66 of Fig. 5; v

Fig. 7 is a section similar to a portion of Fig. 3 but showing the pants in another position; and

I Fig. 8 is a sectional detail. s

In the environment shown the knife mechanism is mounted on a tubular shaft 10 also supporting other parts associated with one of the two annular cores or supports 11 upon which the'tire is built. single knife mechanism is suflioient for both cores,

as the material 12 is severed only when the cores are in juxtaposition "as shown in Fig. 3.

As stated above, only one of the core supports carries a knife. This core' support,

that at the right ,in Fig. 3, and the one shown in Fig. 7 has a shaft'13 extending throu' h it and journaled at its end adja-. cent t e core in'a hub 14. Splined to the end of this shaft is a crank arm 15, shown in end view in Figs. 1 and 2. A knife holdor 16,-ca'rrying a knife 1? at'its outer end, is pivoted at 18 tothe crank arm. The holder is slotted at 19-for a'portion of its length, anda screw 20 passes through the slot and into a plate 21, preferably made relatively heavy for purpose to appear.

A- spacing collar '22 holds the knife holder at the pro er distance from the plate. The plate fits etween the base of the core-supporting spider 23 and a ring 24 held thereto ashy screws 25. It is thus left free to rotate, although it may be frictionally restrained lightly by a plug '26 (Fig. 8) pressed towards the plate'loy aspring located in a recess of the spider. is located between hub 14 and the crank arm 15 to absorb any end thrust involved from the two core heads pressing against each other.

If the knife mechanismbe assumed to he in the position indicated in Fig. 2, andif the shaft be rotated in the direction of the A thrust bearing 27- arrow in that figure,-the followin sequence of operations will take lace, t will he noticed that in this position the crank arm has drawn the knife holder until the outer end of the slot 19 is against the screw 20. The angular position given to the lmife holder will cause the knife to lie Well within any line assumed by the material to he severed. Rotation of the shaft in the direction of the arrow will cause the knife holder to slide along the screw until it reaches the position of Fig. 1, the inertia of the plate'21 or friction of the plug 26 preventing rotation of the plate, during this much of the motion. When the crank arm and knife holder are in line (Fig. 1) the arm strikes a stop pin 28 on the plate. -This 1 causes the crank arm, knife holder, and plate to move as a unit, carrying the knife around in a circular motion one or more times, as may be desired, while extended in cutting position. Upon stopping the rota- "tion of the shaft, if this be done suddenly as is preferable, the inertia of the relatively heavy plate will-cause it to 'o-vertravel the crank arm, bringing the parts to the same relative position as that shown in F ig. 2 (although the parts may be in a difierent relative position to other parts of the mechanism'). It will be seen that'the described .mechanism operates to project the knife from inactive to active position, rotate itabout a circumference to sever the material,

and retract the knife to inactive position.

. The driving mechanism for shaft 13' is best illustrated in Figs. 4, 5, and 6. The power for this purpose is provided by a small motor 30 mounted on a rearwardly extending part of the core support. A chain .31 connects a sprocket on the motor shaft 'of the'reciproca'tion of devices with which the'knife mechanism is associated, while 1'0- tatable in any position by motor 30. Reciprocation of this mechanism is provided for by an air cylinder 38 (Fig. 4), the piston rod 39 of which is attached b a connecting bracket 40 to the tubular sha t 10. Suitable-electrical and mechanical controls may, be provided for the motor and air cylinder,- as will be easily understood.

Having thus described my invention, 1 claim:

1. A device for severing circumferentially arranged material which comprises a rotataable shaft, an arm fixed thereon, a rotatable disk, means for frictionally restraining the rotation' of the disk, a guide on, the. disk, a knife pivoted to the arm and guided by said guide, means to lock the arm and disk together for rotation when the arm has caused the knife to be projected outwardly, and a source of power for rotating the shaft.

2. A device for severing circumferentially arranged material which comprises a rotatable shaft, an arm fixed thereon, a rotatable disk, a guide on the disk, a knife pivoted to the arm and guided by said guide, and meansto lock the arm and disk together for rotation when the arm has caused the knife to be projected outwardly.

3. A device for severing circumferentially arranged material which comprises a rotatablesha-ft, an arm fixed thereon, a disk of relatively high inertia concentric with the shaft, a knife carrier pivoted to the arm and having a slotted connection with the disk, and a stop on the disk adapted to cause conjoint rotation of the arm and disk when in predetermined positions, whereby upon rotationof-the shaft the knife will be projected into cutting position and carried in a circular motion, and upon stoppage of the shaft the inertia of the disk will cause the knife to be-retracted.

THOMAS MIDGLEY. 

